Concrete step



FIG. 1 is a front, left side, top isometric view of the concrete step, a rear, right side, top isometric view being identical;

FIG. 2 is a left side elevational view of the concrete step, a right side elevational view being identical;

FIG. 3 is a top plan view of the concrete step;

FIG. 4 is a bottom plan view of the concrete step; and,

FIG. 5 is a front elevational view of the concrete step, a rear elevational view being identical.

The structural features depicted by broken lines have been provided to illustrate portions of the concrete step that form no part of the claimed design. 

CLAIM I claim the ornamental design for concrete step, as shown and described. 